涡扇发动机低转速部件特性扩展和风车状态性能模拟

Extrapolating component maps into the low speed and simulation of windmilling performance of turbofan engine

关键词:  涡轮风扇发动机  风车状态+  空中起动  部件特性+

Key words:  Turbofan engine  Windmilling~+  Air-starting  Component characteristics~+

摘要:

借助涡扇发动机风车特性研究的最新成果,开展了某型涡扇发动机的风车性能数值模拟研究。首先,基于不可压流理论,附以可压缩效应修正的指数法发展了补充慢车转速以下部件特性的计算模型和计算程序;其次,根据流量连续、压力平衡、功率平衡、燃烧室进出口总温相等及转速相等等约束条件建立了风车状态时涡扇发动机高低压转子及整机的共同工作方程;最后发展了具有一定计算精度的涡扇发动机风车状态特性计算模型和程序,并以某型涡扇发动机为例,计算分析了不同飞行条件下发动机的风车特性,从计算结果看,其趋势是合理的。

Abstract:

This paper has applieded the latest research achievements to model a turbofan engine windmilling performance.Firstly,based on the WR Sexton method,the method and mathematic models of supplementing the sub-idle rotating component characteristics is presented.Secondly,the turbofan windmilling high-low pressure rotor co-working equations and the whole engine co-working equations are established.lastly,a turbofan engine windmilling characteristics under various windmilling conditions are simulated and analyzed.